Improvement in air-heating furnaces



E. H. DOYLE. 'AIR HEATING FURNACE. No. 188,729.

masses.

warms, nomu'momuman. maniac-ran. o c.

3 Sheets-Sheet 1.

Patented March 27,1877.

3 Sheets-Sheet 2.

E. H. DOYLE. AIR'HEATING FURNACE.

Patented March 27,1877.

NVFETERS, PHOTO-UTHOGRAPHER. WASHINGTON. D C

SSheets-Sheet 3.

E. H. DOYLE.

AIR HEATING FURNACE.

No.188,729. Patented March 27,1877.

N. PETERSL FHDTO-UTHOGHAFHER. WASHINGYON. D C- UNITED "STATES FFICPATENT EDWARD H. DOYLE, OF ALBANY, NEW YORK.

Specification forming part of Letters .Patent No. 188,729, dated March27, 1877; application filed November 2, 1875. I

To all whom it may concern:

Be it known that I, EDWARD H. DOYLE, of the city and county of Albany,State of New York, have invented certain Improvements in Air-HeatingFurnaces; and I do; hereby declare that the following is a descriptionthereof, reference being bad to the accompanying drawings, in three,sheets, forming "a part of this specification, in which- Figure 1 is aperspective view of the heater embodying the improvements in thisinvention. Fig. 2 is a sectional elevation taken from side to side, asat lines 1 in Figs. 4, 5,, 6, and 7. Fig. 3 is a sectional elevationtaken from front to rear, as at lines No. 2 in Figs. 4, 5, 6, and 7.Fig. 4 is a horizontal sectional view taken at line No. 1 in Figs. 2 and3. Fig. 5 is a horizontal sectional view taken at line No. 2 in Figs. 2and 3. Fig. 6 is a horizontal sectional view taken at line No. 3 inFigs. 2 and 3. Fig. 7 is a horizontal sectional view taken at line No. 4in Figs. 2 and 3.

My invention relates to furnaces for heating air for warming rooms; andconsists in the several combinations of parts or elements hereinafterdescribed, which are intended to operate more effectually with theheated gases generated in the process of the combustion of the fuel, tohighly heat a great area of surface of heat-radiating plates distributedvariously between the extreme upper and lower portions of the heater,and cause the cold air admitted within the walls of the outer casing topass over all the said extensively-heated surfaces of plates, in such amanner as to have its temperature gradually raised in its passage upwardfrom its point of entrance to its exit. The object of this invention isto render all portions of the heater inclosed within the outer wall ofthe air-space or chamber capable of acting with the air, so that thebase and front portions of the heater may be made to contribute to warmthe same, as well as the rear and the upper portions.

To enable others skilled in the art to make and use my invention, I willproceed to describe it in reference to the drawings, and letters ofreference marked thereon, the same letters indicating like parts.

In the drawings, A represents the ashchamber. B B are flues locatedwithin the base of the furnace, and surrounding the lower portions ofthe ash-chamber, and also 00- cupying the space below the bottom of theash-pit,as shown in Fig. 2. The outer walls B of the flue B B are madewith an incline, as shown in Fig. 2.

O is the front opening to the ash-chamber, and is closed by a door, asis the practice of the trade. D is an annular plate, setting in asand-pocket recess cast with the upper base-plate, and forms a sectionof the walls of the ash-chamber. E is the firepot, supported from theupper edge of plate D from a sand-pocket, and is provided with a grate.F is the combustion chamber proper, made preferably flaring in its sidesfrom its base outward toward the top, and is seated in a sand-pocket. Fis the dome of said ,7 combustion chamber, made with a hemisphericalform, and intended to supplement the combustion-chamber F in both itscapacity and extent of radiating-surface.

G G and G are chambers extending outward from the periphery of the domeF, and between the base and apex of same, as shown in Figs. 2 and 3,with the mouth of each chamber opening to the dome, as shown in Fig. 6.The said chambers themselves are relatively situated with each other asat the points of atriangle. The chamber G, situated in front, isprovided with a .door, through which coals may be passed into thefurnace.

H H are short flues located at the tops of chambers G G G, and leadingfrom the same to the ring-chamber J, which ring-chamber is situatedabove a line with the top of the dome, or nearly so, and directly overthe chambers G G G, as shown in Figs.2 and 3. Made withsaidring-chamber, at its rear, is the exit L, intended to connect withthe smoke- 1pc. p M M are descending flues, located forward of the rearhalf of the furnace, and between the chambers G G and G, as shown inFigs. 1 and 6, and lead from the lower side of the ringchamber J intothe base-flues B B, as shown in Figs. 1 and 2. The said lines are madein sections m m, for convenience in casting, and set in sand-pockets 'n.

M is the ascending flue, leading from the base-flues B B, from the rearof the furnace, to the ring-chamber J above, and directly to the exit L.N N are dampers placed in the ring-chamber at points between the rear,

flues H H and the ascending flue M and exit L above.

Surrounding the base of the furnace is the rim P, Figs. 2, 3, and 4,provided with openings 0 O, for admission of air from below to theair-heating chamber above. Set over the said openings and the inclinedwall B of the flues B, and extending in an inclined manner from theouter edge of rim P toward the fire-pot E is the deflecting-hood R R,which deflecting-hood stops, at its upper end, at a short distance fromthe base of the wall of said fire-pot, sufficient to afford an amplespace for the passage of the air received through the openings 0 O, andfrom the space between the said deflecting-hood and the inclined wall Bof the base-flues B B to the air-heating space inclosed by the casing K,surrounding the several parts of the furnace.

The manner in which the several parts of this improved furnace operatesis as follows: When the dampers N N in the ring-chamber J are turned toopen communication of flues H H H to the exit L, the hot gaseousproducts of combustion will be drawn from the combustion'chamber F tothe dome F; thence into the supplementary chambers G G G, and from them,through flues H, into the ring-chamber J above, when they may pass backto the exit L, to escape to the smokepipe.

In moderately cold weather, this manner of circulation of the hot gasesis advised, as only the walls of the upper portions of the furnace areheated to effect a warming of the air within the casing K.

When the dampers N N are closed, the hot gaseous products of combustionpass from the combustion-chamber F into the dome F, and thence into thesupplementary chambers G G G, and from them into the ring-chamber Jthrough flues H, and from thence be drawn down the descending flueM'Minto the baseflues B B, to circulate therein, and then pass from therear of the said base-flues up the ascending flue M to the exit L. Thismanner of circulation is intended to be used in very cold weather, asthe walls of the descending and ascending flues, and also the outerinclined walls of the base flues, may become highly heated by the hotgases circulating in the same, to operate as radiating-surfaces toeffect a warming of the air moving over the said walls.

The air admitted *within the casing -K be warmed passes from a low pointnear the floor through the openings 0 O, and over the inclined wall B ofthe base-flues B, and between the said inclined wall and thedeflecting-hood R, and is thrown ordi'rected toward the walls of thefire-pot E, to be discharged into the air-heating chamber above at apoint nigh said fire-pot, to rise in a vertical line with the heatedflaring sides of the combustion-chamber, and the heated walls of thechambers G G and ring-chamber J, while portions of the air may also bemade to pass up along the heated vertical side walls of the descendingand ascending flues M M and M.

When the dampers N N are turned to produce a revertible draft into andfrom the base, through flues M M, B B, and M, the areas ofheating-surfaces for operating with the air are greatly increased overthat heretofore had in air-heating furnaces having no arrangement offlues fgr conducting'the hot gases into the base, as in this improvedfurnace.

It may be readily seen that by means of the deflecting-hood and theinclined wall of the base-flues, when the draft is reverted into thebase to heat the said inclined wall of said base-flues, the air may bepartially heated and expanded before it arrives at its point ofdischarge at the fire-pot into the air-receiving space inclosed by'thecasing K; and that, at the said point of discharge, the current of airmay be more highly stimulated and expanded than it would be were the airpermitted to rise vertically from the openings 0 0 into the airheatingchamber above, as heretofore practiced; and that after the air haspassed into the air-heating chamber above, it may be more highly heatedby passing between the heated surfaces of the walls of flues M M andfire-pot and the chambers G G, and between the heated walls of the'domeand ringchamber.

What I claim, and desire to secure by Letters Patent, is-- 1. Thecombination with the baseflues B, having inclined walls B, and openings0 O in the base-rim, of the deflecting-hood R, substantially as and forthe purpose set forth.

2. In an air-heating furnace having descending, ascending, and baseflues and dampers for a revertible draft, the combination of theinclined wall B and deflecting-hood R, inclining over said inclinedwall, substantially as and for the purpose set forth.

3. In an air-heating furnace, the combination, with the ring-chamber Jabove the dome, flues B in the base, of descending flues M M, situatedforward of the rear half of the furnace proper, and ascending flue M,situated at the rear, substantially as and for the .purpose set forth.

4. In an air-heating furnace, the .combina- I ring -chamber J, of thedescending flues M, tion,with the combustion-chamber F, domeF,base-flees B, ascending flue M, and dampers and chambers G G G, havingtheir mouths N, substantially as and for the purpose set opening to thesaid dome, of theflues H H H, forth. ring-chamber J, and exit L,substantially as and for the purpose set'forth.

5; In an air heating furnace, the bombi- Witnesses: nation, with thecombustion chamber F, JAMES WRIGHT, dome F, chambers G G G, flues H, andALEX. SELKIRK.

EDWARD H. DOYLE.

